My lo is 2 weeks old and I pump for her. She was a little early and is just starting to latch on to the boobieanywho, she spits up ALOT. Like every feeding and sometimes an hour after. She takes 2-3oz every 2-3 hours. I use the slowest flow nipple and burp her often. She's very hard to burp and she toots a lot. Is the spit up normal? I have only used formula with my other 3 so I'm in the dark here